This file is indexed.

/usr/share/initramfs-tools/scripts/init-top/all_generic_ide is in initramfs-tools 0.99ubuntu13.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

PREREQ=""
prereqs()
{
	echo "$PREREQ"
}
case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

for x in $(cat /proc/cmdline); do
	case ${x} in
	all_generic_ide)
		modprobe ata_generic all_generic_ide=1
		;;
	all_generic_ide=*)
		if [ ${x#all_generic_ide=} ]; then
			modprobe ata_generic all_generic_ide=1
		fi
		;;
	esac
done